Give four uses of emulsions.

Explanation

**Step-by-Step Solution:**

1. **Definition of Emulsion:**
An emulsion is a type of colloidal solution where one liquid is dispersed in another liquid. There are two main types of emulsions: oil in water (O/W) and water in oil (W/O). Common examples include milk (O/W) and butter (W/O).

2. **Use 1: Healing Effect of Soap:**
Emulsions are used in soaps and detergents. When soap is mixed with water, it forms an emulsion that helps in the cleaning process by allowing oils and dirt to be washed away.

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